West Australian Jason Scrivener is leading the Australian contingent at the ISPS HANDA Perth International.

Jason Scrivener Scrivener fired a 3-under round to move to 11-under and tied fourth for the tournament.

"Yeah it was a good day today, I didn't make too many mistakes - other than the last - but I'm in a good position going into tomorrow," Scrivener said.

"A lot of it is in Louis' (Oosthuizen) hands but if I can go out and shoot a good number tomorrow who knows what will happen," he continued.

Growing up in Mandurah Scrivener has enjoyed the atmosphere at the Lake Karrinyup Country Club with crowds following him throughout the tournament.

"I have all my friends and family following today so that's always nice, it feels very comfortable for me and it's just a good vibe out there," Scrivener said.

With world-21 and pre-tournament favourite Louis Oosthuizen stamping his class on the field firing a 5-under 67 and moving out to a three shot lead by the end of the day Scrivener is quite happy to fly under the radar.

"Everyone else can kind of do the work, they've all won before, done it before, I'm very happy to go under the radar and maybe if I can shoot a low one tomorrow and come up from behind," he said.

"I feel like I haven't played my best golf yet, I've played some solid golf at times but haven't really played my A-game yet. So if I can really fire at a few flags and hit a lot of good shots I think I can shoot a low one out there tomorrow," Scrivener added.

Scrivener would be delighted to take a win in front of a home crowd but says shooting a low score tomorrow and putting himself in the best possible position is his main focus.

"It would be great to win in Perth, it would be awesome to win in front of friends and family but it's a long way away and Louis is a long way ahead."

"If I can play well tomorrow whether I win or not it's still a big advantage to get a tournament at home. It's a great opportunity for all Australians really, the more opportunities we can get here to play on big stages its great," Scrivener said.